GE HEALTHCARE CARESCAPE Monitor B650 Technical Manual page 167

Problem
Unable to turn on the patient
monitor when it is powered
from the monitor battery.
The patient monitor is not
connected to the AC mains.
Failure to turn on the patient
monitor, when the following
conditions apply:
- The patient monitor is
powered up either from
the AC mains or the
battery.
- The red on/standby
button LED in the DC/DC
board is not lit, when you
press the on/standby
button to start the
patient monitor. see
section "11.4".
Unable to turn on the patient
monitor when it is both
connected to AC mains and
a fully charged monitor
battery is installed.
Unable to turn on the patient
monitor:
- The patient monitor
starts, but the primary
display remains "black",
i.e the backlight does not
illuminate the LCD
display.
Possible causes
Battery Empty
Battery Failure or missing
battery.
Battery cable loose.
DC/DC Board failure.
The cable between user
interface board and CPU
board is loose or faulty.
The keypad is faulty.
The user interface board is
faulty.
DC/DC Board failure.
CPU failure.
Faulty DC/DC board. The
DC/DC board does not
supply the +12V for the
LED backlight of the LCD
display.
Recommended actions
Check the battery charge status, see section "6.1.1".
Charge or replace the battery.
Check the status of the battery charge/failure
indicator, see section "6.1.1". Depending on the LED
status:
- Insert a battery.
- Replace the battery.
Check that the battery cable is intact and properly
connected to the DC/DC board.
Replace the DC/DC board.
Check the status of the red ON/Stdby-button LED
on DC/DC board when On/Stdby button is pushed.
During the push LED should illuminate. If it is not
illuminating, the cable between the user interface
board and DC/DC board is loose or faulty, or the
user interface board is faulty.
Check that the cable is intact and properly
connected to the user interface board and the CPU
board.
- Reconnect the cable, if loose.
- Replace the user interface cable, if the cable is
faulty.
Replace the keypad.
Replace the user interface board.
Replace the DC/DC board.
The on/standby signal is routed through the CPU
board, so there is a minor possibility that the CPU is
faulty, if all the other things seems to work, but you
are not able to start the patient monitor neither
from the on/standby button or the remote-on
connector.
The +12V voltage created by the DC/DC board is
used only for LCD display backlight and for the
optional recorder.
Check one of the following:
- Check the status of the yellow +12 V LED in the
DC/DC board, see section "11.4".
- Print something to the optional, built-in
recorder.
- Connect a service PC to the patient monitor and
log in to Webmin to check the status of the
+12V voltage (mV), see section "11.3.1".
If the +12 V is present and within specs, the DC/DC
board is not likely to cause the problem.
Troubleshooting
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